(-42)+57+(-84)+(-23)
(-42)+57+(-84)+(-23)
(1)计算:-2-(-3)+(-8)+42; (2)计算:16 +23 -27 ×(-42).
- |- 0.25 |+(+4分之3)-(-0.125)+|-0.75|
(2+23+234)×(23+234+2345)-(2+23+234+2345)×(23+234)等于多少,
计算:(-6)-(+5)+(-9)+(-4)-(-9)
(+1)+(-2)+(+3)+(-4)++(+99)+(-100)等于几?
计算:(+1)+(-3)+(+5)+(-7)+⋯+(+97)+(-99)
(-5)+3
(-2.48)+(+4.33)+(-7.52)+(-4.33)=
(-32)+68+(-29)+(-68)=
1+(-2)+3+(-4)+…+2005+(-2006)+2007+(-2008)+2009
(9999+9997+.+9001)-(1+3+.+999)